Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS4124030 A
Publication typeGrant
Application numberUS 05/756,781
Publication dateNov 7, 1978
Filing dateJan 5, 1977
Priority dateJan 5, 1977
Publication number05756781, 756781, US 4124030 A, US 4124030A, US-A-4124030, US4124030 A, US4124030A
InventorsWallace A. Roberts
Original AssigneeRoberts Wallace A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electro-therapeutic faradic current generator
US 4124030 A
Therapeutic faradic current generators are used for stimulation of muscles and nerves of a body. Disclosed is such a generator in one embodiment having a unijunction transistor relaxation oscillator that feeds a Schmitt trigger, the output of which gates a power oscillator. The power oscillator drives a pair of electrodes that are put in contact with the skin.
Previous page
Next page
I claim:
1. A faradic current generator, comprising
a single transistor relaxation oscillator having an adjustable firing rate;
a pair of transistors connected to operate as a Schmitt trigger, with two opposite-phased outputs and interconnected emitters, and to receive, at the interconnection of the emitters, the oscillator's output;
a single transistor buffer amplifier, having its input connected to one end of the Schmitt trigger outputs;
a second single transistor amplifier, having its input connected to the other one of the Schmitt trigger outputs, and having a light-emitting diode in the output thereof;
a power oscillator, having two transistors connected in a push-pull configuration, and connected to the output of the buffer amplifier in such a way that a pulse from the buffer amplifier triggers an alternating current burst in the output of the power oscillator for approximately the duration of the pulse; and
means for connecting electrodes to the output of the power oscillator.

The device of this invention is an improved electro-therapeutic faradic current generator for use in the treatment of "cellulite", (which term is defined below), poor circulation and poor muscle tone. Faradic current generators have long been in use. Originally such generators consisted of an induction coil producing a rapidly alternating current. These induction coils consisted of two parallel coils: a primary coil and a secondary coil employed for the production of currents by mutual induction. A rapidly interrupted direct current would be supplied to the primary coil which would induce alternating currents in the secondary coil. The output of the secondary coil would be applied to the skin by electrodes. This direct application of current along with its potential fluctuations could at times cause unpleasant shocks in subjects. Over the years the art developed so that the faradic currents were produced by a type of inverted induction coil sometimes called a converter or a transformer in order to achieve a higher degree of control over the process. Still a malfunction could expose the subject to unexpected shocks as the current is basically received in line from the output of the transformer.


The present invention relates to faradic current generators for therapeutic muscle and nerve stimulation and more particularly relates to transistorized circuitry which produces successive bursts of alternating current in an output transformer. The invention further relates to utilization of dual circuitry, one circuit constant and one circuit variable, accomplished by integrated circuits, to produce an interferential current, the integrated circuits producing a variable frequency faradic wave amplification and oscillation for a multiple output transformer.

It is an object of this invention to provide an improved faradic current generator which does not expose the subject to whom the electrodes are applied to the line current and which will safely provide for improved control over the process. Disclosed herein is a unit for muscle stimulation, especially in the legs for treatment of "cellulite", which term is herein used to refer to deposits of fatty tissue under the skin which cause unsightly bumps. The contraction of the muscles in the area of the cellulite causes a rearrangement of these fatty deposits thereby having a smoothing effect on the skin.

The aforementioned objects will become clearer with reference to the following drawing and Description of the Preferred Embodiment.


The FIGURE is a schematic of a preferred embodiment of the invention.


In operation of a faradic generator in accordance with this invention, the generator is connected to a pair of the electrode paddles. These electrodes are applied to subject's body with reference to particular muscles and the unit produces a variable rate faradic current which stimulates the muscle in the vicinity of the electrodes to contract. The current is generated in bursts having a repetition rate adjustable over a range from 0.5 to 4 seconds. Each burst of current is alternating current, the most desirable frequency which depends in part on the type of muscle to be stimulated; the frequency also affects the consequent sensation felt by the subject. It has been found that 7500 cycles per second is a desirable frequency for use on facial muscles. Frequencies can range from 1,000 to 25,000 cycles per second and at the low end of the range the sensation can be painful while above the 25,0000 cycles per second the muscles fail to respond.

The FIGURE illustrates a schematic diagram of an embodiment of a faradic current generator in accordance with the present invention and embodying one of the improvements disclosed. The power oscillator section 30 is seen whose main component is transformer 32 which is used in conjunction with first transistor 34 and second transistor 36 and capacitor 38. First and second transistors 34 and 36 oscillate at a frequency determined by the physical construction of transformer 32 and by the capacitance of capacitor 38. The output of transformer 32 passes through a 0.5 microfarad capacitor 40 to a 2.5 K ohm potentiometer 42. Potentiometer 42 is the output intensity control adjusted by knob 26 in FIG. 1 and is adjustable between 0 and 100 volts peak to peak of faradic voltage. The output then travels to output plug 22 seen in FIG. 1 into which is connected the output electrodes. The electrodes can be constructed of stainless steel or equivalent material and have a disk-shaped face, about 11/2 inches in diameter, for contacting the skin. The power oscillator section 30 is gated on at a variable rate by pulse section 50. Within pulse section 50 is a unijunction transistor oscillator 52 which may be a 2N4871 transistor or equivalent which fires between 0.5 and 4 second intervals. A 100 K ohm potentiometer 53 controls the firing rate and is adjusted by rate adjustment knob 24 on the face of the unit. The output of transistor 52 enters a Schmitt triggger 54 comprised of two transistors. Each time the unijunction transistor 52 fires a pulse, the two transistors in the Schmitt trigger alternate state. The output of one of the transistors in the Schmitt trigger 54 activates buffer transistor 56 which controls the output of the power oscillator section 30. The second transistor in the Schmitt trigger 54 activates transistor 58 which controls light-emitting diode 60 which is seen as output indicator light 28 on the front panel of casing 30 in FIG. 1. Light-emitting diode 60 lights when a pulse is fired activating the power oscillating section which causes galvanic current at the electrodes. The unit receives power from house current into AC receptacle 62 through a 1/2 amp fuse 21 in line with off/on switch 22. The power when on causes bulb 68 to light indicator 12. The power enters transformer 70 which has an output of 12.6 volts which passes to a bridge rectifier 72 whose output is filtered by an electrolytic capacitor 74 and applied to the circuit.

Although the present invention has been described with reference to particular embodiments, it will be apparent to those skilled in the art that variations and modifications can be substituted therefor without departing from the principles and spirit of the invention.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3108597 *Sep 12, 1958Oct 29, 1963Relaxacizor IncGenerator for electronic muscle stimulator
US3109430 *Jan 29, 1959Nov 5, 1963Electronic Aids IncCardiac nerve control device
US3387147 *Jun 9, 1967Jun 4, 1968Dynatone Electronics CorpMuscle stimulating pulse generator
US3766413 *Jan 3, 1972Oct 16, 1973American Optical CorpRate discrimination circuit
US3794022 *Jun 30, 1972Feb 26, 1974E NawracajDual oscillator, variable pulse duration electrotherapeutic device
US3797500 *Dec 29, 1969Mar 19, 1974Jankelson BMandible stimulator
US3908669 *Dec 17, 1973Sep 30, 1975American Acupuncture Medical IApparatus for use by physicians in acupuncture research
US3911930 *Mar 1, 1974Oct 14, 1975Stimulation TechMethod and structure of preventing and treating ileus, and reducing acute pain by electrical pulse stimulation
US3958577 *Nov 21, 1972May 25, 1976Rodler Ing HansApparatus for treatment with sum currents
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4226246 *May 23, 1978Oct 7, 1980Carba Societe AnonymeApparatus for maintaining the negative potential of human, animal, and plant cells
US4531524 *Dec 27, 1982Jul 30, 1985Rdm International, Inc.Circuit apparatus and method for electrothermal treatment of cancer eye
US4644955 *Mar 4, 1985Feb 24, 1987Rdm International, Inc.Circuit apparatus and method for electrothermal treatment of cancer eye
US4994016 *Jul 27, 1989Feb 19, 1991John AtwoodElectronic stimulating device
US4998913 *Apr 14, 1989Mar 12, 1991Atwood Jr John AElectronic stimulating device
US5099840 *Jan 23, 1989Mar 31, 1992Goble Nigel MDiathermy unit
US5251637 *Nov 2, 1989Oct 12, 1993Solar Wide Industrial Ltd.Electro-therapeutic device
US5778894 *Jan 3, 1997Jul 14, 1998Elizabeth Arden Co.Method for reducing human body cellulite by treatment with pulsed electromagnetic energy
US5808846 *Jul 11, 1995Sep 15, 1998Veris Industries, Inc.Combination current sensor and relay
US6005760 *Apr 8, 1998Dec 21, 1999Veris Industries, Inc.Combination current sensor and relay
US6219216Nov 12, 1999Apr 17, 2001Veris IndustriesCombination current sensor and relay
US6331821 *Aug 10, 2000Dec 18, 2001Veris Industries, Inc.Combination current sensor and relay
US6724600Jan 18, 2002Apr 20, 2004Veris Industries, LlcCombination current sensor and relay
US6856515Dec 10, 2001Feb 15, 2005Veris Industries, LlcCombination current sensor and relay
US6888712Feb 3, 2004May 3, 2005Veris Industries, Inc.Combination current sensor and relay
US6950292Jul 28, 2004Sep 27, 2005Veris Industries, LlcCombination current sensor and relay
US7193829Mar 14, 2005Mar 20, 2007Veris Industries, LlcCombination current sensor and relay
US7203047Jul 21, 2005Apr 10, 2007Veris Industries, LlcCombination current sensor and relay
US7310049Jun 3, 2005Dec 18, 2007Veris Industries, LlcStatus indicator
US7525806Oct 17, 2007Apr 28, 2009Veris Industries, LlcCombination current sensor and relay
US7548404Feb 19, 2008Jun 16, 2009Veris Industries, LlcCombination current sensor and relay
US7634314Nov 30, 2005Dec 15, 2009Ak Beauty Enterprises, LlcPowered stimulation device
US7808758May 5, 2008Oct 5, 2010Veris Industries, LlcCombination current sensor and relay
US7855655Aug 13, 2008Dec 21, 2010Veris Industries, LlcCurrent switch with automatic calibration
US7889473Feb 15, 2011Veris Industries, LlcCombination current sensor and relay
US7902992Aug 13, 2008Mar 8, 2011Veris Industries, LlcStatus indicator
US8212548Jul 3, 2012Veris Industries, LlcBranch meter with configurable sensor strip arrangement
US8306629Jan 5, 2009Nov 6, 2012Thermosurgery Technologies, Inc.Hyperthermia treatment systems and methods
US8692540Aug 13, 2008Apr 8, 2014Veris Industries, LlcSplit core status indicator
US9146264Jan 12, 2012Sep 29, 2015Veris Industries, LlcCurrent meter with on board memory
US9250308May 8, 2012Feb 2, 2016Veris Industries, LlcSimplified energy meter configuration
US9329996Feb 28, 2012May 3, 2016Veris Industries, LlcBranch circuit monitor with paging register
US9410552Jul 31, 2012Aug 9, 2016Veris Industries, LlcCurrent switch with automatic calibration
US9424975Aug 22, 2014Aug 23, 2016Veris Industries, LlcSplit core transformer with self-aligning cores
US20040156157 *Feb 3, 2004Aug 12, 2004Holce Kent J.Combination current sensor and relay
US20050002136 *Jul 28, 2004Jan 6, 2005Holce Kent J.Combination current sensor and relay
US20050015125 *Mar 15, 2004Jan 20, 2005Mioduski Paul C.Hyperthermia treatment systems and methods
US20050157438 *Mar 14, 2005Jul 21, 2005Veris Industries, Inc.Combination current sensor and relay
US20050254186 *Jul 21, 2005Nov 17, 2005Veris Industries, Inc.Combination current sensor and relay
US20060061480 *Jun 3, 2005Mar 23, 2006Marc BowmanStatus indicator
US20070123807 *Nov 30, 2005May 31, 2007Robert ApplebaumPowered stimulation device
US20070232966 *May 30, 2007Oct 4, 2007Robert ApplebaumApparatus for skin and muscle treatment
US20080049403 *Oct 17, 2007Feb 28, 2008Veris Industries LlcCombination current sensor and relay
US20080144246 *Feb 19, 2008Jun 19, 2008Veris Industries, LlcCombination current sensor and relay
US20080239606 *May 5, 2008Oct 2, 2008Veris Industries, LlcCombination current sensor and relay
US20090118802 *Jan 5, 2009May 7, 2009Thermosurgery Technologies, Inc.Hyperthermia Treatment Systems and Methods
US20090185322 *Jul 23, 2009Veris Industries, LlcCombination current sensor and relay
WO1986000539A1 *Jul 16, 1984Jan 30, 1986Hedin, Gene, R.Circuit apparatus and method for electrothermal treatment of cancer eye
WO1990004997A1 *Nov 2, 1989May 17, 1990Solar Wide Industrial Ltd.Electro-therapeutic device
WO2004080147A2Mar 11, 2004Sep 23, 2004Alfatech Medical Systems Ltd.Cellulite ultrasound treatment
U.S. Classification607/71
International ClassificationA61N1/36
Cooperative ClassificationA61N1/36014, A61N1/323
European ClassificationA61N1/36E, A61N1/36